Alt+Tab shows weird colors

So, when I Alt+Tab to get out of the game, but keep it minimized (when I set up a Private Shop for instance), all my PC colors are weird
If I open a web browser, or my Windows explorer, all the colors are very bright with too much contrast (when I close Lineage II, everything goes back to normal).
I've checked the "Optimize performance" option ingame, but that doesn't change anything...
Any idea how to fix this ?
Thanks

Game engine messes with screen gamma when running in fullscreen or when its' window is focused.
Simple solution to this is running game windowed or in letterbox (I believe it's called windowed fullscreen in game settings). Then you use Win+D (collapse all) instead of Alt+Tab and then go to window you need.
If that doesn't help you may lower gamma in game settings. Things will still be messed up this way but not so much.
Complex solution involves patching and is not even acceptable for L2C since game security utilites won't allow such actions.

Oh memories. Same thing happened to me when I first played in 2005-6. I never fixed it, but my old pc is in sillicon heaven and I don't have this problem anymore.

Click to expand...

Actually I did have this problem back in the days, but I was running Windows ... I don't know ... XP maybe ?? ... and now that I'm running W7 Pro 64bits I really thought that this would have disappeared, but ... no